铜冶炼烟尘的控电位氧化浸出

来源期刊:中国有色金属学报(英文版)2018年第9期

论文作者:刘伟锋 傅新欣 杨天足 张杜超 陈霖

文章页码:1854 - 1861

关键词:铜;冶炼烟尘;氧化浸出;电位

Key words:copper; smelting dust; oxidation leaching; potential

摘    要:采用氧化浸出和电位控制技术从铜冶炼烟尘中浸出金属,研究H2O2用量、H2O2加入速度、初始盐酸浓度、浸出温度、初始液固比和浸出时间对金属浸出率的影响。最终得到最优浸出条件为:H2O2用量0.8 mL/g(氧化还原电位为429 mV)、H2O2加入速度1.0 mL/min、初始硫酸浓度1.0 mol/L、初始盐酸浓度1.0 mol/L、浸出温度80 °C、初始液固比5:1 mL/g以及浸出时间1.5 h。在此最优条件下,铜冶炼烟尘中的铜和砷能被有效地浸出,剩下的浸出渣可作为一种合适的铅冶炼资源。此时,铜、砷和铁的平均浸出率分别为95.27%、96.82%和46.65%。

Abstract: A study was conducted for metal extraction from copper smelting dust using the oxidation leaching and control of potential technology. The effects of H2O2 dosage, H2O2 feeding speed, initial HCl concentration, leaching temperature, liquid-to-solid ratio and leaching time on metals leaching efficiencies were investigated. The following optimized leaching conditions were obtained: H2O2 dosage of 0.8 mL/g (redox potential of 429 mV), H2O2 feeding speed of 1.0 mL/min, initial H2SO4 concentration of 1.0 mol/L, initial HCl concentration of 1.0 mol/L, leaching temperature of 80 °C, initial liquid-to-solid ratio of 5:1 mL/g and leaching time of 1.5 h. Under the optimized conditions, copper and arsenic can be effectively leached from copper smelting dust, leaving residue as a suitable lead resource. The average leaching efficiencies of copper, arsenic and iron are 95.27%, 96.82% and 46.65%, respectively.

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